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2 years ago

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Chemistry

1 answer:

vlada-n [284]2 years ago

6 0

Answer: 0.680 mol

Explanation:

From the coefficients of the equation, we know that for every 3 moles of carbon dioxide produced, 5 moles of oxygen gas are consumed.

So, the answer is (5/3)(0.408) = 0.680 mol (to 3 sf)

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The quantity of antimony in a sample can be determined by an oxidation–reduction titration with an oxidizing agent.

kotegsom [21]

Answer:

The percentage is k $= 20.8$ %

Explanation:

From the question we are told that

The mass of the stibnite is $m_s = 5.86 \ g$

The volume of KBrO3(aq) is $V = 26.6 mL = 26.6 *10^{-3} \ L$

The concentration of KBrO3(aq) is $C = 0.125 M$

Now the balanced ionic equation for this reaction is

$BrO_3 ^{-}+ 3Sb^{3+} + 6H^{+} \to Br^{1-} + 3Sb^{5+} + 3H_2O$

The number of moles of $BrO_3 ^{-}$ is

$n = C *V$

substituting values

$n = 26.6*10^{-3} * 0.125$

$n = 0.003325 \ mols$

from the reaction we see that 1 mole of $BrO_3 ^{-}$ reacts with 3 moles of $Sb^{3+}$

so 0.003325 moles will react with x moles of $Sb^{3+}$

Therefore

$x = \frac{0.003325 * 3}{1}$

$x = 0.009975 \ mols$

Now the molar mass of $Sb^{3+}$ is a constant with a values of $Z = 121.76 \ g/mol$

Generally the mass of $Sb^{3+}$ is mathematically represented as

$m = x * Z$

substituting values

$m = 1.215 \ g$

The percentage of Sb(antimony) in the overall mass of the stibnite is mathematically evaluated as

k $= \frac{1.215}{5.85 } * 100$

k $= 20.8$ %

4 0

3 years ago

Read 2 more answers

3.50 moles of Ca = ? grams Ca

torisob [31]

Answer:

The mass of 3.5 moles of Ca is 140 g to two significant figures.

Explanation:

6 0

3 years ago

Help! Giving brainliest!!!!

Nuetrik [128]

For the triplet AUG, I got methionine, which is a start codon. For GCU, I got alanine.

7 0

3 years ago

Sodium and chlorine react to form sodium chloride. If there are 1.4 moles of sodium used, how many moles of chlorine were requir

sammy [17]

Answer:

0.7 moles of Chlorine gas is required.

Explanation:

The reaction is balanced as follows:

2Na + $Cl_{2}$ ------> 2NaCl

According to stoichiometry,

2 mole Sodium reacts with 1 mole Chlorine gas

∴1 mole Sodium reacts with 1/2 moles of Chlorine gas

∴1.4 mole sodium reacts with 1.4/2 moles of Chlorine gas

= 0.7 moles of Chlorine gas

So, 0.7 moles of Chlorine gas is required.

3 0

3 years ago

Which is a physical change? A) Rusting iron B) Burning paper C) Reacting baking soda and vinegar D) Separating a mixture of salt

Deffense [45]

Answer:

Explanation:

7 0

3 years ago